A calorimetric study of periodate species in aqueous solution

1968 ◽  
Vol 46 (16) ◽  
pp. 2679-2683 ◽  
Author(s):  
E. E. Mercer ◽  
D. T. Farrar
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Sodium Periodate ◽  
Ionization Constant ◽  
Periodic Acid ◽  
Heats Of Formation ◽  
Calorimetric Study ◽  
Kcal Mole ◽  
Acid Ionization Constant ◽  
Acid Ionization

Heats of several reactions involving sodium periodate, NaIO4(c), have been measured in an isothermal jacketed calorimeter. The apparent acid ionization constant of periodic acid was redetermined at an ionic strength of 0.13. From these data the following values for heats of formation at 25.00° have been calculated: NaIO4(c), −105.15 ± 0.30; IO4−(aq), −38.8 ± 0.4; H5IO6(aq), −188.9 ± 1.0; H4IO6−(aq), −186.3 ± 1.0 kcal/mole.

The acidity constant of fluorene-9-carboxylic acid in aqueous solution. Determination of the pKa of a sparingly soluble substance

1993 ◽  
Vol 71 (2) ◽  
pp. 227-229 ◽  
Author(s):  
A. J. Kresge ◽  
I. G. Pojarlieff ◽  
E. M. Rubinstein
Keyword(s):  
Aqueous Solution ◽  
Carboxylic Acid ◽  
Ionization Constant ◽  
Acid Group ◽  
Acidity Constant ◽  
Carboxylic Acid Group ◽  
Soluble Substance ◽  
Acid Ionization Constant ◽  
Acid Ionization

The acid ionization constant of the carboxylic acid group of fluorene-9-carboxylic acid in aqueous solution at 25 °C was determined to be pKa = 3.61, using a method based upon the increase in solubility of this sparingly soluble substance brought about by its ionization. This corrects an earlier considerably different value of this quantity determined by equating pKa with the pH measured at half-neutralization. The hazard inherent in the latter method when applied to sparingly soluble substances is discussed.

The Acid Ionization Constant of HOCl from 5 to 35°

1966 ◽  
Vol 70 (12) ◽  
pp. 3798-3805 ◽  
Author(s):  
J. Carrell Morris
Keyword(s):  
Ionization Constant ◽  
Acid Ionization Constant ◽  
Acid Ionization

Heats of formation of RuO4, RuO42−, and related compounds

1969 ◽  
Vol 47 (4) ◽  
pp. 581-586 ◽  
Author(s):  
E. E. Mercer ◽  
D. T. Farrar
Keyword(s):  
Sodium Periodate ◽  
Heats Of Formation ◽  
Basic Solution ◽  
Heat Of Reaction ◽  
Kcal Mole ◽  
Heats Of Reaction ◽  
Related Compounds

The heat of reaction of ruthenium metal with bromine in basic solution, according to the equation[Formula: see text]has been measured calorimetrically. In addition, the heat of oxidation of barium ruthenate hydrate by sodium periodate to form RuO4(aq) has been determined. From these heats of reaction, and several other heats measured here, the heats of formation of several ruthenium species have been calculated. The more important of these are: Na2RuO4(aq), ΔHf = −224.1 ± 0.8; RuO42−(aq), ΔHf = −109.4 ± 1.0; RuO4(aq), ΔHf = −57.5 ± 1.1; RuO4(l), ΔHf = −57.0 ± 1.1 kcal/mole.

scholarly journals First acid ionization constant of the drinking water relevant chemical cyanuric acid from 5 to 35 °C

2018 ◽  
Vol 4 (10) ◽  
pp. 1522-1530 ◽  
Author(s):  
David G. Wahman
Keyword(s):  
Drinking Water ◽  
Cyanuric Acid ◽  
Ionization Constant ◽  
Acid Ionization Constant ◽  
Acid Ionization

The first acid ionization constant (K6) for cyanuric acid was determined from 5 to 35 °C where or and ΔH° = 33.4 ± 1.7 kJ mol−1.

Coordinating Properties of Aromatic and Aliphatic Sulfur with Bivalent Metals in Aqueous Solution. A Calorimetric Study

1979 ◽  
Vol 32 (4) ◽  
pp. 709 ◽  
Author(s):  
R Aruga
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Complex Formation ◽  
Aqueous Medium ◽  
Formation Constants ◽  
Calorimetric Study ◽  
Thermodynamic Quantities ◽  
Direct Calorimetry ◽  
Bivalent Metals

Heats and entropies of complex formation of the thiophen-2-carboxylate ion with Ni2+, Cu2+, Zn2+ and Cd2+ have been determined by direct calorimetry, the formation constants being known from the literature. The measurements were carried out in aqueous medium at 25�C and an ionic strength of 1. The values of the thermodynamic quantities for thiophen-2-carboxylate, compared with those for (ethylthio)acetate and (phenylthio)acetate obtained previously, indicate a greater tendency for aromatic sulfur to form bonds with the above metals than for aliphatic sulfur. The causes of this behaviour are discussed.

THE KINETICS OF THE FORMATION OF THE MONO–FLUORO COMPLEX OF IRON (III) IN AQUEOUS SOLUTION

1960 ◽  
Vol 38 (4) ◽  
pp. 567-575 ◽  
Author(s):  
D. Pouli ◽  
W. MacF. Smith
Keyword(s):  
Aqueous Solution ◽  
Ionic Strength ◽  
Aqueous Solutions ◽  
Temperature Interval ◽  
Kcal Mole ◽  
Entropy Of Activation ◽  
Fluoro Complex ◽  
Kinetics Of

The kinetics of the reactions involved in the formation of the mono–fluoro complex of iron (III) in aqueous solutions have been examined spectrophotometrically at ionic strength 0.5 and over the temperature interval 0.1 to 12.1 °C. The results are interpretable on the assumption that the following two reactions contribute significantly to the rate Fe+++ + F− = FeF++ and Fe+++ + HF = FeF++ + H+, the former having a heat of activation of 22.8 ± 2.5 kcal mole−1 and an entropy of activation of 35 ± 9 cal deg−1 mole−1, the latter having a heat of activation of 8.7 ± 0.7 kcal mole−1 and an entropy of activation of −24.5 ± 3 cal deg−1 mole−1.

THE KINETICS OF THE FORMATION OF THE MONOSULPHATO COMPLEX OF IRON (III) IN AQUEOUS SOLUTION

1962 ◽  
Vol 40 (9) ◽  
pp. 1836-1845 ◽  
Author(s):  
G. G. Davis ◽  
W. MacF. Smith
Keyword(s):  
Experimental Data ◽  
Aqueous Solution ◽  
Ionic Strength ◽  
Continuous Flow ◽  
Hydrogen Ions ◽  
Kcal Mole ◽  
Forward Reaction ◽  
First Order ◽  
Kinetics Of Formation ◽  
Kinetics Of

The kinetics of formation of the monosulphato complex of iron (III) has been examined spectrophotometrically using a continuous-flow technique over the range of temperatures 15.6 to 34.5 °C in an aqueous medium of ionic strength 0.5 and a range of concentrations of hydrogen ions 0.05 to 0.30 M. The experimental data may be interpreted on the assumption that the significant reactions are a bimolecular association opposed by a first-order dissociation [Formula: see text] For the forward reaction ΔH≠ is 18.0 kcal mole−1 and ΔS≠ is 19.4 cal mole−1 deg−1.

scholarly journals Prediction of Thermodynamic and Structural Properties of Sulfamerazine and Sulfamethazine in Water Using DFT and ab Initio Methods

2018 ◽  
Vol 62 (1) ◽  
Author(s):  
Neda Hazhir ◽  
Farhoush Kiani ◽  
Hasan Tahermansouri ◽  
Saraei Ghorbani-Hasan Azade ◽  
Fardad Koohyar
Keyword(s):  
Ab Initio ◽  
Structural Properties ◽  
Density Functional ◽  
Ionization Constant ◽  
Intermolecular Hydrogen Bond ◽  
Research Work ◽  
Dft Methods ◽  
Polarized Continuum Model ◽  
Acid Ionization Constant ◽  
Acid Ionization

The acid-ionization constant (pK<sub>a</sub>) is an important physico-chemical property of molecules. In this research work, the ab initio and density functional theory (DFT) methods, in combination with the polarized continuum model (PCM), were used to calculate the acid-ionization constant of sulfamethazine (SMZ) and sulfamerazine (SMR) solved in water. For these molecules, the calculated pK<sub>a</sub> value is in relatively good agreement with the experimental one. Also, in these calculations some structural properties such as dihedral angle between the indicated atoms: D, bond lengths between the indicated atoms: d, Bohr radius: a˳, intermolecular hydrogen bond: IHB, and total atomic charge: au have been determined. These data can be used in nano drug modeling of sulfamethazine and sulfamerazine.

Sign in / Sign up

Export Citation Format

Share Document